Installation
20
WSHP-SVX10H-EN
PSC Blower Motor Speed Retrofit
PSC motors installed in the unit have multiple speed
configurations. To modify the rpm of the motor, the following
steps may be followed.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is present
with a voltmeter.
1. Locate the blower motor relay inside the chassis control
box.
2. Remove the undesired speed tap.
3. Select desired speed tap wire by using information from
4. Connect desired tap wire to the 1K4 relay at spade 4.
5. Reconnect power to the unit.
Table 11. Lead change
Lead Colors
Lead Speed
High
Low
Blower
1G
9A
ECM CFM Settings
To adjust the CFM, disconnect the power to the unit. Set the
DIP switch located in the control box to the desired profile
setting. Connect the power to the unit.
Figure 18. Units with Deluxe 24V or Tracer
®
ZN510
controls and ECM motors – DIP switch
settings
Note:
Units with the optional ECM with deluxe 24V or
Tracer® ZN510 controls are shipped from the factory
on Profile B.
•
Profile A = 110% of rated airflow
•
Profile B = 100% of rated airflow
•
Profile C = 90% of rated airflow
•
Profile D = 80% of rated airflow
Installation at higher altitudes may require an adjustment to the
fan speed setting to achieve proper airflow. Use profile C or D
to get lower airflow. If a lower CFM is needed, then set DIP
switch 4 to ON.
ON
FLASH
OFF
Manual Lockout (condensate
overflow)
ON
ON
OFF
Compressor Disable
Table 10. Deluxe controller diagnostic LEDs (continued)
Color: Green
Color: Red
Controller Mode
LED1
LED2
LED3
